These are just some simple measuring tools to use for measuring gaps. I added a hole to keep them together on a keyring. I found most of the thickness gauges to be more like a ruler, which is fine in some cases, but sometimes the gap is shallow and you need to be able to stick one measure in and test it.
I printed in PLA, 0.1mm layer height to accurately get to the half millimetre marks. The depth of the text is 0.2mm, so it prints in two layers.
The author marked this model as their own original creation.